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CVE-2017-0090 : Detail

CVE-2017-0090

8.8
/
HIGH
Overflow
15.38%V3
Network
2017-03-16 23:00 +00:00
2017-08-15 07:57 +00:00
CVE.org
NVD

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Descriptions

Uniscribe in Microsoft Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, and Windows 7 SP1 allows remote attackers to execute arbitrary code via a crafted web site, aka "Uniscribe Remote Code Execution Vulnerability." This vulnerability is different from those described in CVE-2017-0072, CVE-2017-0083, CVE-2017-0084, CVE-2017-0086, CVE-2017-0087, CVE-2017-0088, and CVE-2017-0089.

Informations

Related Weaknesses

CWE-ID Weakness Name Source
CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.

Metrics

Metric Score Severity CVSS Vector Source
V3.0 8.8 HIGH CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Base: Exploitabilty Metrics

The Exploitability metrics reflect the characteristics of the thing that is vulnerable, which we refer to formally as the vulnerable component.

Attack Vector

This metric reflects the context by which vulnerability exploitation is possible.

Network

A vulnerability exploitable with network access means the vulnerable component is bound to the network stack and the attacker's path is through OSI layer 3 (the network layer). Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable one or more network hops away (e.g. across layer 3 boundaries from routers).

Attack Complexity

This metric describes the conditions beyond the attacker's control that must exist in order to exploit the vulnerability.

Low

Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.

Privileges Required

This metric describes the level of privileges an attacker must possess before successfully exploiting the vulnerability.

None

The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.

User Interaction

This metric captures the requirement for a user, other than the attacker, to participate in the successful compromise of the vulnerable component.

Required

Successful exploitation of this vulnerability requires a user to take some action before the vulnerability can be exploited. For example, a successful exploit may only be possible during the installation of an application by a system administrator.

Base: Scope Metrics

An important property captured by CVSS v3.0 is the ability for a vulnerability in one software component to impact resources beyond its means, or privileges.

Scope

Formally, Scope refers to the collection of privileges defined by a computing authority (e.g. an application, an operating system, or a sandbox environment) when granting access to computing resources (e.g. files, CPU, memory, etc). These privileges are assigned based on some method of identification and authorization. In some cases, the authorization may be simple or loosely controlled based upon predefined rules or standards. For example, in the case of Ethernet traffic sent to a network switch, the switch accepts traffic that arrives on its ports and is an authority that controls the traffic flow to other switch ports.

Unchanged

An exploited vulnerability can only affect resources managed by the same authority. In this case the vulnerable component and the impacted component are the same.

Base: Impact Metrics

The Impact metrics refer to the properties of the impacted component.

Confidentiality Impact

This metric measures the impact to the confidentiality of the information resources managed by a software component due to a successfully exploited vulnerability.

High

There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact. For example, an attacker steals the administrator's password, or private encryption keys of a web server.

Integrity Impact

This metric measures the impact to integrity of a successfully exploited vulnerability. Integrity refers to the trustworthiness and veracity of information.

High

There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to the impacted component.

Availability Impact

This metric measures the impact to the availability of the impacted component resulting from a successfully exploited vulnerability.

High

There is total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable).

Temporal Metrics

The Temporal metrics measure the current state of exploit techniques or code availability, the existence of any patches or workarounds, or the confidence that one has in the description of a vulnerability.

Environmental Metrics

 nvd@nist.gov
V2 9.3 AV:N/AC:M/Au:N/C:C/I:C/A:C nvd@nist.gov

EPSS

EPSS is a scoring model that predicts the likelihood of a vulnerability being exploited.

EPSS Score

The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.

EPSS Percentile

The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.
EPSS First.org

Exploit information

Exploit Database EDB-ID : 41653

Publication date : 2017-03-19 23:00 +00:00
Author : Google Security Research
EDB Verified : Yes

Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1029 We have encountered a number of crashes in the Windows Uniscribe user-mode library, while trying to display text using a corrupted font file. While crashes in this specific family take various shapes and forms, they all occur in functions directly or indirectly called by USP10!BuildFSM. An example crash excerpt is shown below: --- (5020.4074): Access violation - code c0000005 (first chance) First chance exceptions are reported before any exception handling. This exception may be expected and handled. eax=000000cc ebx=0964b270 ecx=0964c6aa edx=0038f409 esi=00000782 edi=0963d7d0 eip=751f968d esp=0038f3bc ebp=0038f468 iopl=0 nv up ei pl nz ac pe nc cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00010216 USP10!BuildDynamicStatesStaticInputs+0x45d: 751f968d 668944b302 mov word ptr [ebx+esi*4+2],ax ds:002b:0964d07a=???? 0:000> kb ChildEBP RetAddr Args to Child 0038f468 751f7a33 00000048 09649700 0000001a USP10!BuildDynamicStatesStaticInputs+0x45d 0038f6a0 751f7076 095d3d88 095e1fa8 0038f6cc USP10!BuildFSM+0x193 0038f6b0 751fc5f4 c10125b4 095d3d88 095c6124 USP10!LoadArabicShapeTables+0x106 0038f6cc 751ea5a0 c10125b4 0963d7d0 0000001a USP10!ArabicLoadTbl+0xd4 0038f6f0 751ea692 095c6124 c10125b4 0000001a USP10!UpdateCache+0xb0 0038f704 751f152d c10125b4 095c6000 751f15db USP10!ScriptCheckCache+0x62 0038f710 751f15db 00000001 00000001 095c62e8 USP10!GetShapeFunction+0xd 0038f748 751f2b14 00000001 00000000 0038f7c8 USP10!RenderItemNoFallback+0x5b 0038f774 751f2da2 00000001 00000000 0038f7c8 USP10!RenderItemWithFallback+0x104 0038f798 751f4339 00000000 0038f7c8 095c6124 USP10!RenderItem+0x22 0038f7dc 751e7a04 000004a0 00000400 c10125b4 USP10!ScriptStringAnalyzeGlyphs+0x1e9 0038f7f4 76ca5465 c10125b4 095c6040 0000000a USP10!ScriptStringAnalyse+0x284 0038f840 76ca5172 c10125b4 0038fc28 0000000a LPK!LpkStringAnalyse+0xe5 0038f93c 76ca1410 c10125b4 00000000 00000000 LPK!LpkCharsetDraw+0x332 0038f970 763c18b0 c10125b4 00000000 00000000 LPK!LpkDrawTextEx+0x40 0038f9b0 763c22bf c10125b4 00000040 00000000 USER32!DT_DrawStr+0x13c 0038f9fc 763c21f2 c10125b4 0038fc28 0038fc3c USER32!DT_GetLineBreak+0x78 0038faa8 763c14d4 c10125b4 00000000 0000000a USER32!DrawTextExWorker+0x255 0038facc 763c2475 c10125b4 0038fc28 ffffffff USER32!DrawTextExW+0x1e 0038fb00 01196a5c c10125b4 0038fc28 ffffffff USER32!DrawTextW+0x4d [...] 0:000> !heap -p -a ebx address 0964b270 found in _DPH_HEAP_ROOT @ 95c1000 in busy allocation ( DPH_HEAP_BLOCK: UserAddr UserSize - VirtAddr VirtSize) 95c2ed4: 964b270 1d8c - 964b000 3000 5dbb8e89 verifier!AVrfDebugPageHeapAllocate+0x00000229 77580f3e ntdll!RtlDebugAllocateHeap+0x00000030 7753ab47 ntdll!RtlpAllocateHeap+0x000000c4 774e3431 ntdll!RtlAllocateHeap+0x0000023a 5fcca792 vrfcore!VfCoreRtlAllocateHeap+0x00000016 751f6644 USP10!UspAllocCache+0x00000054 751f7975 USP10!BuildFSM+0x000000d5 751f7076 USP10!LoadArabicShapeTables+0x00000106 751fc5f4 USP10!ArabicLoadTbl+0x000000d4 751ea5a0 USP10!UpdateCache+0x000000b0 751ea692 USP10!ScriptCheckCache+0x00000062 751f152d USP10!GetShapeFunction+0x0000000d 751f2b14 USP10!RenderItemWithFallback+0x00000104 751f2da2 USP10!RenderItem+0x00000022 751f4339 USP10!ScriptStringAnalyzeGlyphs+0x000001e9 751e7a04 USP10!ScriptStringAnalyse+0x00000284 76ca5465 LPK!LpkStringAnalyse+0x000000e5 76ca5172 LPK!LpkCharsetDraw+0x00000332 76ca1410 LPK!LpkDrawTextEx+0x00000040 763c18b0 USER32!DT_DrawStr+0x0000013c 763c22bf USER32!DT_GetLineBreak+0x00000078 763c21f2 USER32!DrawTextExWorker+0x00000255 763c14d4 USER32!DrawTextExW+0x0000001e 763c2475 USER32!DrawTextW+0x0000004d [...] --- The issue reproduces on Windows 7. It is easiest to reproduce with PageHeap enabled, but it is also possible to observe a crash in a default system configuration. In order to reproduce the problem with the provided samples, it might be necessary to use a custom program which displays all of the font's glyphs at various point sizes. Attached is an archive with 2 crashing samples. Proof of Concept: https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/41653.zip

Products Mentioned

Configuraton 0

Microsoft>>Windows_7 >> Version *

Microsoft>>Windows_server_2008 >> Version *

Microsoft>>Windows_server_2008 >> Version r2

Microsoft>>Windows_vista >> Version *

References

https://www.exploit-db.com/exploits/41653/
Tags : exploit, x_refsource_EXPLOIT-DB
http://www.securityfocus.com/bid/96607
Tags : vdb-entry, x_refsource_BID
http://www.securitytracker.com/id/1037992
Tags : vdb-entry, x_refsource_SECTRACK

More information
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